get_additional_action
Description:
[ Version ( since = "0.72" ) ]
public unowned Action get_additional_action (AdditionalActionType type)
  public unowned Action get_additional_action (AdditionalActionType type)
Retrieves the action (#PopplerAction) that shall be performed when an additional action is triggered on this,
      or null.
Parameters:
| this | |
| type | 
           the type of additional action  | 
      
Returns:
| 
           the action to perform. The returned object is owned by this and should not be freed.  |